fix: rename parentNode callback param to nextParentNode

Author: fritz-c

README.md

@@ -46,7 +46,7 @@ treeData<br/>_(required)_ | object[]       | Tree data with the following keys:
 onChange<br/>_(required)_ | func           | Called whenever tree data changed. Just like with React input elements, you have to update your own component's data to see the changes reflected.<div>`( treeData: object[] ): void`</div>
 getNodeKey<br/>_(recommended)_ | func      | Specify the unique key used to identify each node and generate the `path` array passed in callbacks. It uses [`defaultGetNodeKey`](https://github.com/fritz-c/react-sortable-tree/blob/master/src/utils/default-handlers.js) by default, which returns the index in the tree (omitting hidden nodes).<div>`({ node: object, treeIndex: number }): string or number`</div>
 generateNodeProps         | func           | Generate an object with additional props to be passed to the node renderer. Use this for adding buttons via the `buttons` key, or additional `style` / `className` settings.<div>`({ node: object, path: number[] or string[], treeIndex: number, lowerSiblingCounts: number[], isSearchMatch: bool, isSearchFocus: bool }): object`</div>
-onMoveNode                | func           | Called after node move operation. <div>`({ treeData: object[], node: object, parentNode: object, prevPath: number[] or string[], prevTreeIndex: number, nextPath: number[] or string[], nextTreeIndex: number }): void`</div>
+onMoveNode                | func           | Called after node move operation. <div>`({ treeData: object[], node: object, nextParentNode: object, prevPath: number[] or string[], prevTreeIndex: number, nextPath: number[] or string[], nextTreeIndex: number }): void`</div>
 onVisibilityToggle        | func           | Called after children nodes collapsed or expanded. <div>`({ treeData: object[], node: object, expanded: bool, path: number[] or string[] }): void`</div>
 onDragStateChanged        | func           | Called when a drag is initiated or ended. <div>`({ isDragging: bool, draggedNode: object }): void`</div>
 maxDepth                  | number         | Maximum depth nodes can be inserted at. Defaults to infinite.

src/react-sortable-tree.js

@@ -219,7 +219,12 @@ class ReactSortableTree extends Component {
     depth,
     minimumTreeIndex,
   }) {
-    const { treeData, treeIndex, path, parentNode } = insertNode({
+    const {
+      treeData,
+      treeIndex,
+      path,
+      parentNode: nextParentNode,
+    } = insertNode({
       treeData: this.state.draggingTreeData,
       newNode: node,
       depth,
@@ -239,7 +244,7 @@ class ReactSortableTree extends Component {
       nextTreeIndex: treeIndex,
       prevPath,
       prevTreeIndex,
-      parentNode,
+      nextParentNode,
     });
   }